Excellichlamys histrionica
NameExcellichlamys histrionica
Scientific NameExcellichlamys histrionica
Common NameHarlequin Scallop
FamilyPectinidae
GenusExcellichlamys
Specieshistrionica
Geographic DistributionIndo-Pacific region, including areas such as the Philippines, Japan, Australia, and other tropical western Pacific waters.
Average Size (mm)20-40
Identifying FeaturesDistinctive fan shape, prominent radial ribs (often with scales or nodules), well-developed auricles, and highly variable but often vibrant and contrasting color patterns resembling a harlequin's costume.
Dietfilter-feeder
Raritycommon
Author Citation(Gmelin, 1791)
Description
A small, colorful scallop shell, characterized by its fan-like shape and striking harlequin-like color patterns. The shell exhibits prominent radial ribs and distinct auricles (ears) on either side of the umbo. This specimen displays a cream to white background adorned with alternating bands of orange-red and dark brown to black markings, particularly concentrated on the ribs.
